Amalgamating-pan



(No Model.)

J. A. BIDWELL. AMALGAMATING PAN.

Patented Mar. 3, 1885.

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JULIUS A. BIDVELL, OF IVANPAH, CALIFORNIA.

AlVlALGAlVlATING-PAN.

SPECIFICATION forming part of Letters Patent No. 313,164, dated March 3, 1885.

Application iilcd November 2S, 1884.

To all whom it may concern.-

Beit known that I, .IULIUs A. BIDWELL, of Ivanpah, county of San Bernardino, State of California, have invented an Improvement in Amalgamating-Pans; and I do hereby de- .clare the following to be a full, clear, and exact description of the same.

My invention relates to certain improvements in amalgamating-pans in which a mass of quicksilver pulp and chemicals is heated by steam; and it consists of an attachment or device Within which a thermometer is contained and through which the temperature may be communicated directly to the ther- 1nometer-bulb,while the stem and index-plate project to the exterior of the pan, so that they may be readily inspected.

Referring to the accompanying drawings for a more complete explanation of myinvention, Figure l is a side elevation of a pan with a part broken away, showing my device applied so as to project from the side of the pan. Fig. 2 is an enlarged View of this form of the device. Fig. 3 shows the pan with the device applied so as to project vertically through the top. Fig. 4 is an enlarged view of this form.

In a former patent, issued to me August 19, 1884i, No. 303,693, I have shown an amalgamating-pan having an inverted Siphon-shaped receptacle or pipe filled with quicksilver, one end of the pipe extending into the pan, while the other projects outside and has a thermometer inserted into its outer end. I have found this device objectionable, because the quicksilver within the pipe soon becomes charged with amalgam and solidilies, and the thermonieter-bulb, being set at the outer end and exterior to the pan, does not show correctly the temperature. In my present invention A is a hollow bulb, having a stem, B, extending outwardly from it, to which a pipe or extension, C, may be connected by a coupling, D. Within the enlargement A the bulb E of a thermometer is placed. The stem F extends outward and upward into the tube C. The upper portion of the tube() may have theside cut away, as shown at G, and an index or scale, H, may be placed behind it to show the point at which the mercury within the thermometer stands. This device may be inserted into the amalgamating-pan I in any suitable (No model.)

or desirable way. This style of pans is usually made of wood and closed, having stirring or agitating arms or mullers, which are caused to rotate within the pan by means of a vertical shaft in the usual manner. IVhen it is desired to apply this device to the side of the pan, an opening is made therein horizontally, and of sufficient diameter to receive the stem B, which is driven through it from the inside, the bulb A thus remaining close to the side of the pan.

In order to hold the bulb squarely whilethe elbow or couplingl) is being screwed uponits outer end, it may be flattened upon two opposite sides, so that a wrench may be applied to it, or it may have wedge-shaped lugs J,which can be driveninto the side of the pan, so as to prevent the device from turning round. They serve also to hold it rmly in place after it has been fixed. In this case the elbow D changes the direction from a horizontal to a vertical one, and the thermometer-tube must be bent so as to correspond with the curved elbow D. When the tube is in the same line with the tube B, the thermometer may be straight, and the device may be inserted through a cover of the pan so that'v the enlargementA is within the contents from which it is heated.

In order to provide a good conductor, the chamber A is iilled with mercury to such a point thatit will stand slightly above the thermometer-bulb, and will thus convey the heat from the interior of the .pan directly to the thermometer-bulb. By this construction I am enabled to preserve the quicksilver in its fluid condition, as it has no direct communication with the contents of the pan, and by extending the bulb of the thermometer to its ICO extends to the outside of the pan, Substantially tube and has escale placed exterior' to the pan, as herein described. substantially :LS herein described. Ic

2. A closed hollow chamber containing In witness whereof I have hereunto set my qulcksilver, xed Within an anlalganlatinghand.

5 pan, and having a tube extending` outwardly JULIUS A. BIDVELL.

.rom it, in combination with 2t thermometer Vjtnesscs:

the bulb of which lies Within the quicksilver GEO. H. STRONG, in the chamber while its stem lies within the l S. H. NOURSE. 

